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Description
Technical data for the ER20 Ø9 mm collet
| Technical Data | |
|---|---|
| Hole diameter d | 9-8 mm |
| Outside diameter D | 21 mm |
| Overall length L | 31.5 mm |
ER20 9 mm collet – reliable clamping of medium diameters with increased vibration resistance
The ER20 collet with a clamping range of 8-9 mm offers stable tool holding in the medium size range used to machine machine and structural components. Hardened 65Mn steel with a hardness of 44-48 HRC combined with compliance with DIN 6499 guarantees a maximum radial runout of 0.015 mm. The 0.9 mm collapse range provides flexibility in selecting tools with slightly different shank diameters.
Key advantages of the ER20 9 mm collet
- Radial runout limited to 0.015 mm in accordance with DIN 6499 – positioning accuracy essential for precision finishing
- Clamping range of 8-9 mm with a tolerance of 0.9 mm – the ability to use tools with shanks across the full collapse range of the system
- ER20 construction measuring 21×31 mm – substantial mass that effectively absorbs vibration generated during milling and drilling
- 65Mn spring steel hardened to 44-48 HRC – material that guarantees consistent clamping force over many years of service
- Full compliance with ISO 15488 – compatibility with tool holders from leading CNC machine manufacturers
A collet designed for securing end mills, twist drills, machine taps, and reamers used to machine structural steels, aluminum alloys, and engineering plastics. The 9 mm diameter is a common size for tools used to machine medium-sized parts. The ER20 system exceeds the compact ER11 and ER16 systems in vibration resistance, allowing operation at higher cutting parameters without compromising surface quality. A proven solution for machine shops and manufacturing facilities.
Frequently asked questions
It is used to secure end mills, twist drills, machine taps, reamers, and other tools with a straight shank within the 8-9 mm range. The 0.9 mm clamping tolerance allows shanks with minimally different diameters to be fitted.
The ER20 design measuring 21×31 mm has significantly greater mass than the ER16 measuring 17×28 mm. The increased mechanical rigidity reduces vibration more effectively during machining, providing a better surface finish on parts.
The miniature ER11 measures 11.5×18 mm, the commonly used ER16 measures 17×28 mm, the medium-sized ER20 measures 21×31 mm, the reinforced ER32 measures 33×40 mm, and the largest ER40 measures 41×46 mm. The system designation appears on the body of each collet in accordance with the requirements of DIN 6499.
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Shipping
All orders are delivered by courier company GLS. For orders exceeding 369 PLN gross shipping is FREE
| Courier GLS | Przelew24 / Prepayment | 14,76 zł gross | Delivery time 1 working day |
| Courier GLS | Cash on delivery | 17,26 zł gross | Lead time 1 working day |
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